Unsure if my rtx 3090ti is bottlenecked by PCIE lanes

[cleric_warlock]

Just got my first ever pc build up and running and am unsure of how to be sure if my GPU is being bottlenecked in pcie bandwidth by my current setup. The main components of my build are an intel i9 12900KS cpu (20 pcie lanes, gen 5 support), the aforementioned gpu (pcie 4.0 x16, 24GB VRAM), the asus rog maximus z690 hero mobo, and the m.2 expansion card that comes with the mobo and supports pcie 5.0 ssds. The m.2 card in its expansion slot uses 8 pcie lanes, leaving the gpu at 8 pcie 4.0 lanes. I am only ever using one of the 2 m.2 nvme ssds at a time and both are identical and have windows 11 operating systems on them (chose not to use RAID intentionally). One is in the primary slot next to the cpu and the other is in the primary slot of the expansion card. Would I see a noticeable gpu performance increase if I were to remove the m.2 expansion card and only operate the ssd next to the cpu? Would I see a similar performance increase if I instead left the expansion card on and removed the ssd next to the cpu?

[RONOTHAN##]

You might see an increase if you removed the one in the x8 slot depending on what you do, but it's only in a few games and maybe 3-5% in the ones that do. It's enough that I'd put the SSD in a chipset slot instead cause realistically you won't notice the latency penalty from the chipset, though depending on what you do it might be more or less important. 

 

If you're doing some rendering tasks with the 3090 Ti, you want as much bandwidth as you can for that card and you likely will notice a difference between it running at x8 Gen 4 and x16 Gen 4. 

[cleric_warlock]

5 minutes ago, RONOTHAN## said:

You might see an increase if you removed the one in the x8 slot depending on what you do, but it's only in a few games and maybe 3-5% in the ones that do. It's enough that I'd put the SSD in a chipset slot instead cause realistically you won't notice the latency penalty from the chipset, though depending on what you do it might be more or less important. 

 

If you're doing some rendering tasks with the 3090 Ti, you want as much bandwidth as you can for that card and you likely will notice a difference between it running at x8 Gen 4 and x16 Gen 4. 

I read on another forum that having a lot of vram can eliminate the pcie bottlenecking in a lot of situations, and this is mainly a gaming pc, do you think my vram might prevent bottlenecking?

[RONOTHAN##]

12 minutes ago, cleric_warlock said:

I read on another forum that having a lot of vram can eliminate the pcie bottlenecking in a lot of situations, and this is mainly a gaming pc, do you think my vram might prevent bottlenecking?

Maybe? again, it's minimal to begin with. If you want to see benchmarks, look up the 3090 on Gen 3 vs. Gen 4 since Gen 3 x16 is the same bandwidth as Gen 4 x8, and the 3090 is very similar performance as the 3090 Ti and VRAM capacity is the same.